DeepSeek open-sources DeepSeek Harness agent runtime

On August 13, 2026, DeepSeek open-sourced an agent runtime called DeepSeek Harness (CLI name dsh). The repo gained roughly 50,000 stars in 12 hours, 92,000 by hour 28, and over 186,000 stars with 20,000+ forks within ten days. Every layer of the agent is a plugin, including the agent loop itself, and the project is labeled a developer preview.

• Repo hit ~50,000 stars in 12 hours and 186,000+ within ten days
• Every agent layer is a plugin: model adapter, tools, sandbox, UI and the agent loop
• The default web profile prints 152 separately installable plugins
• Supports ~40 model providers with OS-level sandboxing via bwrap, Landlock and Seatbelt